In 2018, CO2 emissions from fossil-based energy sources have reached another historical record, of about 37.1 tonnes of CO2 a year, with an even worse prognosis for 2019. After a small stabi-lizing period between 2015 and 2016, CO2 in the air has just been increasing approximately 1% each year despite that the share of renewable energies has been increasing worldwide. These figures outline the challenge of the energy transition of our society: to address the increasing need of energy – in all its forms – that our lifestyles demand each day. In the last two decades, with the mainstreaming of sustainability measures at local, na-tional and trans-national scales, governments have engaged with large-scale plans of technological restructuring to tackle CO2 emissions. The largest amount of policies and interventions have addressed emissions as if it is a matter of establishing a more ef-ficient and greenest supply of energy. Investments in energy effi-ciency cover all dimensions of human life, both collective and individual. They include interventions in smart mobility systems and investments in housing isolation. They also include the im-provement of household appliances and the strengthening of en-vironmental performance norms.